somewhere between 0.8 and 0.9 the profile page became broken for most themes as "threads started" ($threads) was changed to the more accurate "topics started" ($topics)
If you don't want to edit your theme profile page, here's a mini-plugin to fix the problem:
function profile_fix_topics_to_threads() {global $topics, $threads; $threads=$topics;}
add_action( 'bb_profile.php', 'profile_fix_topics_to_threads');